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Pregnant tested for thyroid, lower than the normal range. Is it normal during pregnancy?

I am 28 weeks pregnant. While screening for thyroid dysfunctions, I got normal TSH and t3, but t4 was 24, hence was asked for a free t4 test which was normal. I had been asked to test 4 weeks and 8 weeks after that. I am not on any medications . The 4 weeks TSH and ft4 was within normal range, but the 8 weeks test which I did yesterday, came back with TSH 1.2 and ft4 .59, which is lower than the lab normal range, which is .61. I was worried about hyperthyroidism till now, and now the fear is shifted to hypothyroidism . The TSH has maintained in the normal range all through out. Is it normal in pregnancy or should I be worried?
Asked On : Sat, 16 Feb 2013
Answers:  1 Views:  41
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Endocrinologist 's  Response

Your TSH is normal and in pregnancy your Total T4 can be 1.5 times the upper limit of normal. Your Free T4 has been normal. Your concern now seems to be related to low FT4. since you have no other clinical features of hypothyroidism, i would prefer to repeat your FT4 in another lab.
Answered: Wed, 20 Mar 2013
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